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30 Cards in this Set
- Front
- Back
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02.01
Which layer chooses and determines the availability of communicating partners along with the resources necessary to make the connection, coordinates partnering applications, and forms a consensus on procedures for controlling data integrity and error recovery? |
The Application layer (Layer 7) is responsible for finding the network resources broadcast from a server and adding flow control and error control (if the application developer chooses). |
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02.02 Which layer is responsible for converting data packets from the Data Link layer into electrical signals? |
The Physical layer (Layer 1) takes frames from the Data Link layer and encodes the 1s and 0s into a digital signal for transmission on the network medium. |
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02.03 At which layer is routing implemented, enabling connections and path selection between two end systems? |
The Network layer (Layer 3)provides routing through an internetwork and logical addressing. |
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02.04 Which layer defines how data is formatted, presented, encoded, and converted? |
The Presentation layer (Layer 6) makes sure that data is in a readable format for the Application layer. |
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02.05 Which layer is responsible for creating, managing, and terminating sessions between applications? |
The Session layer (Layer 5) sets up, maintains, and terminates sessions between applications. |
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02.06 Which layer manages the transmission of data across a physical link and is primarily concerned with physical addressing and the ordered delivery of frames? |
PDUs at the Data Link layer (Layer 2) are called frames. As soon as you see frame in a question, you know the answer. |
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02.07 Which layer is used for reliable communication between end nodes over the network and provides mechanisms for establishing, maintaining, and terminating virtual circuits as well as controlling the flow of information? |
The Transport layer (Layer 4) uses virtual circuits to create a reliable connection between two hosts. |
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02.08 Which layer provides logical addressing that routers use for path determination? |
The Network layer (Layer 3) provides logical addressing, typically IP addressing, and routing. |
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02.09 Which layer specifies voltage, wire speed, and connector pinouts and moves bits between devices? |
The Physical layer (Layer 1) is responsible for the electrical and mechanical connections between devices. |
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02.10 Which layer combines bits into bytes and bytes into frames and uses MAC addressing? |
The Data Link layer (Layer 2) is responsible for the framing of data packets. |
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02.11 Host 1 sent a SYN packet to Host 2. What will host 2 send in response? A. A.ACK B. NAK C. SYN-ACK D. SYN-NAK E. SYN |
Host 1 sent a SYN packet to Host 2. What will host 2 send in response? A. A. ACK B. NAK C. SYN-ACK D. SYN-NAK E. SYN |
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02.12 TCP and UDP reside at which layer of the OSI model? A. 1 B. 2 C. 3 D. 4 |
TCP and UDP reside at which layer of the OSI model? A. 1 B. 2 C. 3 D. 4 (TCP and UDP are Transport layer protocols) |
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02.13 Which layer of the OSI model provides a user interface in the form of an entry point for programs to access the network infrastructure? A. Application B. Transport C. Network D. Physical |
Which layer of the OSI model provides a user interface in the form of an entry point for programs to access the network infrastructure? A. Application B. Transport C. Network D. Physical |
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02.14 You are connected to a server on the Internet and you click on a link on the server and receive a time-out message. What layer could be the cause of this message? A. Application B. Transport C. Network D. Physical |
You are connected to a server on the Internet and you click on a link on the server and receive a time-out message. What layer could be the cause of this message? A. Application (Note that the question states “you are connected to the Internet, so the lower layers are fulfilled.) B. Transport C. Network D. Physical |
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02.15 Which layer of the OSI model is responsible for code and character-set conversion as well as recognizing data formats? A. Application B. Presentation C. Session D. Network |
Which layer of the OSI model is responsible for code and character-set conversion as well as recognizing data formats? A. Application B. Presentation C. Session D. Network |
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02.16 At which layers of the OSI model do bridges, hubs, and routers primarily operate, respectively? A. Physical, Physical, Data Link B. Data Link, Data Link, Network C. Data Link, Physical, Network D. Physical, Data Link, Network |
At which layers of the OSI model do bridges, hubs, and routers primarily operate, respectively? A. Physical, Physical, Data Link B. Data Link, Data Link, Network C. Data Link, Physical, Network (Routers are Network layer devices. Bridges, like Switches -- are Data Link layer devices. Hubs, like Repeaters, are Physical layer.) D. Physical, Data Link, Network |
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02.17 Which layer of the OSI model is responsible for converting data into signals appropriate for the transmission medium? A. Application B. Network C. Data Link D. Physical |
Which layer of the OSI model is responsible for converting data into signals appropriate for the transmission medium? A. Application B. Network C. Data Link D. Physical |
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02.18 A receiving host has failed to receive all the segments that it should acknowledge. What can the host do to improve the reliability of this communication session? A. Send a different source port number. B. Restart the virtual circuit. C. Decrease the sequence number. D. Decrease the window size. |
A receiving host has failed to receive all the segments that it should acknowledge. What can the host do to improve the reliability of this communication session? A. Send a different source port number. B. Restart the virtual circuit. C. Decrease the sequence number. D. Decrease the window size. (TCP uses windowing by default. Decreasing window size allows the receiving host to communicate to the sending host that it needs to slow-down transmission to not overwhelm its buffers. |
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02.19 Which Layer 1 devices can be used to enlarge the area covered by a single LAN segment? (Choose two.) A. Switch B. NIC C. Hub D. Repeater E. RJ-45 transceiver |
Which Layer 1 devices can be used to enlarge the area covered by a single LAN segment? (Choose two.) A. Switch (FYI … Layer 2) B. NIC C. Hub D. Repeater E. RJ-45 transceiver |
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02.20 Segmentation of a data stream happens at which layer of the OSI model? A. Physical B. Data Link C. Network D. Transport |
Segmentation of a data stream happens at which layer of the OSI model? A. Physical B. Data Link C. Network D. Transport (Breaks larger data streams from the upper layers of the model into segments) |
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02.21 When data is encapsulated, which is the correct order? A. Data, frame, packet, segment, bits B. Segment, data, packet, frame, bits C. Data, segment, packet, frame, bits D. Data, segment, frame, packet, bits |
When data is encapsulated, which is the correct order? A. Data, frame, packet, segment, bits B. Segment, data, packet, frame, bits C. Data, segment, packet, frame, bits D. Data, segment, frame, packet, bits |
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02.22 What are two purposes for segmentation with a bridge (Select all that apply)? A. To add more broadcast domains B. To create more collision domains C. To add more bandwidth for users D. To allow more broadcasts for users |
What are two purposes for segmentation with a bridge (Select all that apply)? A. To add more broadcast domains B. To create more collision domains C. To add more bandwidth for users D. To allow more broadcasts for users |
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02.23 Acknowledgments, sequencing, and flow control are characteristic of which OSI layer? A. Layer 2 B. Layer 3 C. Layer 4 D. Layer 7 |
Acknowledgments, sequencing, and flow control are characteristic of which OSI layer? A. Layer 2 B. Layer 3 C. Layer 4 (A reliable Transport layer uses acknowledgement to minimize lost data) D. Layer 7 |
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02.24 Which of the following are types of flow control? (Choose all that apply.) A. Buffering B. Cut-through C. Windowing D. Congestion avoidance E. VLANs |
Which of the following are types of flow control? (Choose all that apply.) A. Buffering B. Cut-through C. Windowing D. Congestion avoidance E. VLANs |
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02.25 What is the purpose of flow control? A. To ensure that data is retransmitted if an acknowledgment is not received B. To reassemble segments in the correct order at the destination device C. To provide a means for the receiver to govern the amount of data sent by the sender D. To regulate the size of each segment |
What is the purpose of flow control? A. To ensure that data is retransmitted if an acknowledgment is not received B. To reassemble segments in the correct order at the destination device C. To provide a means for the receiver to govern the amount of data sent by the sender D. To regulate the size of each segment |
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02.26 At which layer of the OSI model would you find IP? A. Transport B. Network C. Data Link D. Physical |
At which layer of the OSI model would you find IP? A. Transport B. Network (Note that in TCP/ IP, TCP is Transport layer, while IP is Network layer.) C. Data Link D. Physical |
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02.27 Of the following, which is the highest layer in the OSI model? A. Transport B. Session C. Network D. Presentation |
Of the following, which is the highest layer in the OSI model? A. Transport B. Session C. Network D. Presentation (Not the highest overall, which would be Application, but the highest in the list) |
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02.28 Routers perform routing at which OSI layer? A. Physical B. Data Link C. Network D. Transport E. Application |
Routers perform routing at which OSI layer? A. Physical B. Data Link C. Network (Routers are Layer 3 devices that route packets. An alternative name for a router is a “Layer 3 Switch.”) D. Transport E. Application |
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02.29 Which of the following mnemonic devices can you use to remember the first letter of the name of each layer of the OSI model in the proper order? A. All People Seem To Need Processed Data B. Always Should People Never Threaten Dog Police C. Please Do Not Throw Sausage Pizza Away D. All Day People Should Try New Professions |
Which of the following mnemonic devices can you use to remember the first letter of the name of each layer of the OSI model in the proper order? A. All People Seem To Need Processed Data B. Always Should People Never Threaten Dog Police C. Please Do Not Throw Sausage Pizza Away (One of many. I use “People Don’t Need Those Stupid Packets Anyways.”) D. All Day People Should Try New Professions |
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02.30 Which IEEE standard specifies the protocol for CSMA/CD? A. 802.2 B. 802.3 C. 802.5 D. 802.11 |
Which IEEE standard specifies the protocol for CSMA/CD? A. 802.2 B. 802.3 (802.3 regulates Ethernets… which are collision domains. Another formal title for Ethernet is “Carrier Sense Multiple Access with Collision Detection” -- or CSMA/ CD. ) C. 802.5 D. 802.11 |
